Question

There are 50 pearls in black and white in a cup. The white #col is 10 more

Black, then what is the number of black pearls?​

Answer 1

Answer:

• There are 20 black pearls in the cup.

Step-by-step explanation:

Given that:

• There are 50 pearls of black and white colours in a cup.
• The white pearls are 10 more than the black pearls.

To Find:

• What is the number of black pearls?

Let us assume:

• Number of black pearls be x.
• Number of white pearls = x + 10

Finding the number of black pearls:

According to the question.

Total pearls = Black pearls + White pearls

⟶ 50 = x + x + 10

⟶ 50 = 2x + 10

⟶ 2x = 50 - 10

⟶ 2x = 40

⟶ x = 40/2

⟶ x = 20

∴ Number of black pearls = 20

Answer 2

Answer:

Given :-

No. of pearls = 50

White pearl is 10 more than Black pearl

To Find :-

Number of black pearls

Solution :-

By one variable

Let the number of black pearl = x and white pearl be x + 10

$\sf \: 50 = x + x + 10$

$\sf \: 50 = 2x + 10$

$\sf \: 50 - 10 = 2x$

$\sf \: 40 = 2x$

$\sf \: x \: = \dfrac{40}{2}$

$\sf \: \: x = 20$

No. of white pearl = 20 + 10 = 30

No. of black pearl = 20